![]() ![]() ![]() See the previous articles in this series for basic information on using XPath with Java See the W3Schools XPath tutorial for a review of XPath. ![]() It is also strongly recommended you download the resources package, which contains sample code, and user documentation. The Saxon HE package, documentation, additional code samples are all available from the Saxon website ( ). However due to a documented bug in the saxon9he.jar, the SaxonSampler must be built and executed using the IntelliJ IDEA in order to avoid a run time error. NOTE:The DefaultHandlerSample can be built an executed from the command line. IntelliJ IDEA was used to build and execute both the Default Handler and the Saxon code samples. The second code example (Saxon Sample) uses the Saxon HE parser, version 9.7. This article and the code examples were written using Java SE 8u111. This article does not attempt to teach XPath nor Java. This article assumes the reader has a working knowledge of XPath, and core Java. Second: Use the SAX parser from Saxon ( ) to evaluate the same inventory.xml file using XPath expressions.First: Use the SAX Parser from the package to retrieve information from the inventory.xml file by defining and using a DefaultHandler to handle callback events from the parser.Now attention is switched to using SAX parsers by looking at two ways to use a SAX Parser with Java to process XML files: The previous articles in this series (listed in the next section) concentrated on the usage of DOM parsers. If the XML data is too large for the resulting model to fit in memory, or handling of special characters or XML tags is required, then a SAX parser may be the only option. However, they also tend to be slower than DOM parsers. * SAX – Simple API for XML – These parsers are usually single-pass, event driven XML parsers that do not store the document model in memory and consequently have a much lower memory requirement which makes then better suited for large XML files. ![]() Since the DOM is memory resident, evaluation of the XPath expressions is faster. * DOM – Document Object Model – This popular class of parsers read the entire XML file and construct the DOM in memory. XPath is used to retrieve and interpret information represented in XML files using either a DOM or SAX parser. ![]()
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